Lightning-arrester



W. L. COOK.

LIGHTNING ARRESTER.

APPucATxoN man SEPT. 2. 1919.

PatentedSept. 20, 1921. l

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UNITED STATES PATENT OFFICE.

WALLACE L. COOK, 0F CHICAGO, ILLDI'OIB.

LIGHTNING-ARREST A A l 1,391,046. Specification ot Letters Patent. Patented Septv, 192.1,

Application mea september a, isis. semi no. masa i' To all wlwm it may concer/n.: closed as modiiications of the speciiic struc- Be it-known that I, WALLACE L. Coox, citizen of the United States, residin at Chicago, in the county of Cook and tate of Illmois have invented a certain new and useful mprovement in Lightning-Arresters, of which the following is a full, clear, concise and exact description reference being had to the accompanylng drawings forming a art of this specification.

y invention relates to lightning arresters and more particularly to a cross arm lightning arrester of the air-gap type having a ca acity fora plurality of wires.

t is an object of the invention to (provide a lightning arrester which is strong, urable, roc bullet and weather proof and which readily mounted on the usual telephone or telegraph cross arms, in such a position as to permitthe cover being swung open between the different wires. The arresters previously commonly used have usually been small porcelain affairs, comparatively diilicult to wire and easily broken.

Other arresters now in use are nerally not thoroughly water proof am?e frequently cause grounds en the line.

Another object of the invention is to provide a lightnm arrester on the saw-tooth discharge to carillon principle which is self cleaning and which has means for spacing and positioning the several wires and maintainin them in their respective positions op oslte the discharge plates.

Another object is toprovide an arrester for outside use which is so shaped that it ywill be close to the arm on which 1t is mounted so as not to be in the linemans way.

Another object is to provide an arrester o'f the character described with a capacity for a plurality of wires, to be used in outside work and for draining lines of lightning at the cross arm without groundin the lines. Other objects of the invention w1ll be `apparent from the following detailed description of the device disclosed in the drawing accompanying this s ecification. In this s cification and 1n the rawmgs I have disclbesed one form which my invention may take, which form is the best known to me at the present time. However it is to be understood that by this specification and the accompanying drawings .I do not intend to limit myself to the specific construction disture may be required in the manufacture thereofvor may occur to those skilled in this art. The real nature and scope of the invention disclosed is to be determined from the claims appended to this specification.

The same reference characters have been used to desi ate the same parts throughout the several gures of the drawing wherein- Figure 1 1s an elevation of my arrester with thebase and cover members shown in section; and

Fig. 2 is a vertical section taken 011 line 2-2 of Fig. 1.

My arrester comprises a base member 1 and a cover member 2. The base member 1 is provided with an end extension 3 which fits between two extensions 4 on the -cover member 2. These extensions are provided with perforations through which passes a pivot pin 5. The extenslons and the pivot pin constitute a hinge for the covermember so that it may be swung relative to the base member 1 as indicated in dotted lines 2 shown in Fig. 1. A cotter in 6 prevents accidental displacement of e in 5.

The base member- 1 is provi ed with downwardly extendin ears 7 having perforations 8 through whic bolts or screws lmay be passed for attaching the Iarrester to the cross arm of atelephone -or telegraph line sup port. The ears are positioned along one edge of the base member 1 and' project laterally therefrom as -is shown in Fig. 2. With this construction the ears may be in contact with the cross arm and the cover .may swing about its pivot 5. The entire arrester lies close to the cross arm to which it is attached and is therefore not in the linemans `way. The cover member 2 may be swung upwardly between the wires and will readily vpass therebetween inasmuch as the entire present instance. These standards supportan insulatin member 10 preferably made of porcelain. his insulating member is shaped asshown in cross section in Fig. 2 and its `upstanding edges 11 vprovide supporting means for a pluralit of saw tooth metal discharge plates 13. hese plates rest in depressions 14 formed in the edges 11. The

depressions 14 prevent the. plates from getting out of alinement. The plates are malntained in position by means of bolts 15 5 which pass through the insulatlng member 10 and are sealed therein as shown at 16 in Fig. 2. Each discharge plate 13 is provided at its outer end with a terminal connecting screw 17 by means of which the wires may be connected to the plates. The upper and lower sets of plates 13 are identical in construction and are merely positioned in opposite directions.

The base member 1 is provided with a plurality of openings 18 through which the wires may pass. There is one opening for each contact plate and the openings are arranged in two parallel rows as will be clear from the drawings. The wires leading to the upper discharge plates 13 pass through the openings adjacent the ears 7, extend up behind the insulating member 10 and are connected to the upper plates b means of the screwsV 17. The wires lea ing to the lower discharge plates 13 pass u` through the openings immediately below t e ends of the plates and are connected to the plates by means of the lower screws 17. The depressed or recessed portion 19 of the insulating memberlO accommodates a metal plate 20 on top of which is positioned a carbon block 21. The plate 20 and the carbon block 2l are securely maintained in position on the member 10 by means of bolts 22 passing through the member 10 and the block and plate. At the left hand end of the insulating member 10 as shown in Fig. 1 is provided a connecting screw or bolt 23 to which the ground wire may be attached. This wire leads downwardly through an opening 24 shown at the left of Fig. l. Asl there is onlyone ground 'wire only one perforation 24 1s necessary.

It will be noted from Fig. 1 that the discharge plates 13 are provided with serrated or saw tooth edges 25 which edges are spaced a short distance from the carbon block 21 in order to provide the necessary air-gap. The insulating member is secured to the standards 9 by means of screws or bolts 26 clearly shown in the drawings.

The base member 1 and the cover member 2 4are preferably made of cast iron of such a thickness as to be able to withstand rocks, bullets, etc., and the ed es of the cover member project downwar l beyond the base member, as shown in the drawings. This construction affords a water proof casin which is practically completely closed against the entrance of all dust or dirt and which will eifectivel exclude birds, insects, etc. The wires lea ing to the discharge plates 13 usually completely close the openings 18 and 24'so that no dust or dirt can enter through the perforations.

From the above description the construction and operation of my invention will be apparent.

What I claim as new and desire to secure by United States Letters Patent is:

1. A device of the character described comprising an insulating member, a plurality of rows of discharge plates arranged sideA y side carried thereby, and a base member supporting the insulating member, said base member having a row of openings therein in line with said discharge plates to space and position a plurality of wires and maintain them tively to the discharge plates.

2. A device of the character described comprising an insulating member, a carbon block, a conducting plate interposed between said carbon block and said insulating member, said block having an unbroken outer surface, and a plurality of rows of discharge plates carried by said insulating member and positioned adjacent the outer surface of said carbon block -in oppositely arranged pairs, whereby a plurality of said discharge plates is adapted to coperate with a single block.

3. A device of the character described comprising an insulating member, a conducting plate mounted thereon, a carbon block having plane unbroken side faces secured to the top of said plate, and a lurality of discharge plates having serrated) edges carried by the insulating member, and posi-v tioned adjacent the plane side faces of said carbon block.

4. A device of the character described' comprising an insulating member, a conducting plate mounted on said member, means to connect a ground wire to said plate, a carbon block having plane unbroken side faces secured on said plate, a plurality of discharge plates positioned on said member with their ends spaced from the plane side face of said carbon block, and means carried bythe other ends of said discharge plates for connecting line wires thereto.

5. A device of the character described comprising an insulating member, a conducting plate mounted on said member, means to connect a ground wire to said plate, a carbon block secured on said plate, a plurality of rows of metallic discharge plates having saw-tooth edges and positioned on said member with their ends spaced from said carbon block on opposite sides thereof, and means carried by the other g ends of said discharge plates lfor connecting line wires thereto.

6. device of the character described compr1sing an lnsulating member having vraised edges, a conducting plate and carbon block mounted on said member between said edges, transverse depressions in said edges,-

discharge plates positioned in said depress'ions with their ends adjacent the carbon block and means for securing line wires to the ends of the discharge plates projecting beyond said edges.

7 A device of the character described comprising a base member provided with perforations, an insulating member carried by said base `member and provided with raised edges, a conducting plate and carbon block secured to the insulating member between said raised edges, discharge plates mounted on said raised edges with their inner ends spaced from said carbon block and with their outer ends projecting beyond said edges, and means to connect wires, extending through said perforations, to the projecting ends of said discharge plates.

8. A device of the character described comprising a base member provided with two rows of perforations, an insulating member supported by and parallel with the base member projecting edges on said insulating member forming a depression between them, a conducting plate and an overlying carbon block secured to said insulating member within the depression, discharge plates mounted upon said edges and provided with serrated ends positioned adjacent said carbon block, and means to connect line wiil' to the outer ends, of said discharge plate, the wires for certain of said discharge plates being adapted to pass through certain of said perforations and along the face of said insulating member opposite said carbon 'block to said plates.

In witness whereof I hereunto subscribe my name this 29th day of August, A. D. 1919.

WALLACE L. COOK. 

